原位漫反射红外光谱技术用于气固催化反应机理的研究

漫反射傅立叶变换红外光谱技术是一种对固体粉末样品进行直接测量的光谱方法,是近年来发展起来的一项较理想的原位表征技术。原位漫反射红外技术由于可直接对催化剂表面的吸附态物种给出红外信号,可方便地跟踪鉴定反应中间态和产物,从而为催化反应体系反应机理的考察给出直接的证据。本文对于原位漫反射红外技术用于低温水煤气变换反应和水汽逆变换反应、醇类的水蒸汽重整、含CO₂的合成气制取甲醇、低碳烃制合成气、CO催化氧化以及其他烃类和含氧化合物的氧化等方面进行了综述,认为该技术可很好地剖析气固相催化反应机理。

Application of In Situ DRIFTS in the Investigation of Reaction Mechanisms for Gas Solid Catalytic Reactions

Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) is one of spectral methods to measure solid powder samples directly, and is recently receiving increasing interest as an ideal in-situ technology. This in situ DRIFTS can give the signal of adsorption species, track the reaction intermediates and products, thus provides the direct evidence for the reaction mechanism. The gas solid catalytic reactions using in situ DRIFTS were reviewed, including low temperature water-gas-shift and reverse water-gas-shift reaction, ethanol steam-reforming reaction, methanol synthesis from CO₂-containing syngas, syngas synthesis from low-carbon hydrocarbon, catalytic CO oxidation, oxidation of other alkylaromatics and oxygen-containing organic compounds. In situ DRIFTS is considered to be an effective tool to give an insight of reaction mechanisms for gas solid catalytic reaction systems.